Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714803f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #148.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from an ongoing program to study the properties of dust and ionized gas in E/S0 galaxies with dust lanes. Our observational program comprises of H-alpha and broad-band images obtained with the SAAO 1.9m, the VATT 1.8m and the 1m telescope on WO.
A detailed analysis of 30 galaxies shows the presence of a diffusely distributed ionized gas component in most objects. The extended gas morphology is typically smooth and closely follows the dust structure, with a clear correlation between the mass of both components. The dust content in each galaxy is estimated by measuring the extinction by the extragalactic dust in the dark lanes. The derived extinction law is used to correct the measured colors for intrinsic dust extinction and the data are fitted with a stellar population synthesis model. We find that the line-emission and colors of most objects are consistent with the presence of an “old” stellar population ( 10 Gyr) and a small fraction of a “young” population ( 10- 100 Myr).
The younger stellar population may have formed at a later stage of the evolution of the galaxy through either a merger event or a secondary star-formation burst. Strong evidence for the external origin of the ISM is provided by the apparent inclination of the dust and ionized gas disks with respect to the galactic plane in a large fraction of our sample galaxies. Further spectroscopic observations will be obtained to study the gaseous disks dynamics and to characterize the underlying stellar populations for evidence of multiple phases of star formation and assembly history.
Song J.
Borsch N.
Finkelman Ido
Funes José G.
Kniazev Alexei
No associations
LandOfFree
Ionized Gas in E/S0 Galaxies with Dust Lanes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Ionized Gas in E/S0 Galaxies with Dust Lanes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionized Gas in E/S0 Galaxies with Dust Lanes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1395239